enable detect-minikube by default.

[gsquared94]

Related: #4747
enable detect-minikube flag by default.

[codecov]

Codecov Report

Merging #5154 (a1f6c97) into master (6dbe2d2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5154   +/-   ##
=======================================
  Coverage   72.35%   72.35%           
=======================================
  Files         382      382           
  Lines       13589    13589           
=======================================
  Hits         9832     9832           
  Misses       3038     3038           
  Partials      719      719           

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/flags.go	87.50% <ø> (ø)

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